High beams + Low beams (how to)

[LeSabreUltra]

I have searched, but didn't find anything that fit my situation or in a manner that I felt comfortable using on my car.

Some of you know I recently did a projector retrofit on my LeSabre. I have a dual projector setup, D2S low beams and H1 halogen high beams. Wiring up the H1s is relatively simple enough, but to put less wear on the HIDs I'd like to wire it up so that the low beams stay on when the high beams are on.

I have the HID's powered via a relay, and it was suggested that I splice into the high beam power wire and send it over to the signal input for the low beam relay to keep the low beams on when the switch occurs, which makes sense and all.

Problem is, I'd like to retain my DRLs, and I don't know how this would affect the situation. I don't want my low beams coming on all the time.

Also, eventually (or perhaps right away) I'd like to relay the high beams, which would cause further complications for the DRLs. Sounds like it may be easier to just disable DRL?
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[LeSabreUltra]

Okay, well I had a burst of inspiration today with my factory service manuals and figured this one out on my own. Here's what I did.

To do this, you need a relay powering the low beams, otherwise this will not work. Which, if you have HIDs you should anyway, there simply is no good reason not to, whether it works on stock wiring or not. If you have stock halogens, buying a low beam 9006 relay would help your output a lot and allow you to do this mod safely.

I bought a 99 cent diode from radioshack. Wired in a jumper wire with the diode attached from the high beam power wire (green on mine) to the input switch for the low beam relay. This way, the diode will not allow the low beam power to escape back to the high beams. As it turns out, the lower voltage power coming from the DRLs, perimeter lighting etc is NOT enough to trip the relay and activate the low beams, so everything performs to 100% factory spec, except now the lows stay on with the highs without a single flicker. In addition, with this method there should be no concern with overtaxing the electrical system, considering the low beams get all their power from the relay.

Perimeter lighting doing it's job:



Low beams only (look blue cause they're warming up)



Lows and highs:



This would be a good how-to for someone trying to get dual high/low beams with their aftermarket HID system, or on stock halogens.
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[LeSabre in Buffalo]

Thanks for figuring out the wiring, Dan! That may find its way into my car sometime. I love my low beams, and get sad when they go away when flipping on the high beams.